We paid an extra fee to the phone company to keep it
unlisted...... ;-)

We used to when it was $1/month. Now they want $5!

It's generally annual.

$20.00.

And worth it IMHO.

$5 a month here. Not worth it to me.
I just traded off Call Waiting (which I hate) for Privacy Manager, and
haven't had an unwanted phone call since.